黑龙江穆棱天然东北红豆杉种群资源特征研究

 根据74条样带、436.872 hm2抽样面积的调查结果，对黑龙江穆棱东北红豆杉(Taxus cuspidata)自然保护区内天然东北红豆杉种群数量、种群分布与生态因子的相互关系进行了研究，结果表明：在保护区34 544 hm2范围内天然东北红豆杉种群数量庞大，个体数高达179 613株。天然东北红豆杉种群的分布对海拔、坡向、坡位和坡度等生态因子具有选择性。700～800 m是种群的最适海拔范围；分布在阴坡的天然种群数量明显高于阳坡；山地的中部和上部更适合东北红豆杉生长；东北红豆杉种群多数分布在坡度15度以下的山地，随着坡度的增加，天然种群的数量明显减少。

POPULATION CHARACTERISTICS OF YEW (TAXUS CUSPIDATA) IN THE MULING YEW NATURE RESERVE, HEILONGJIANG PROVINCE

Based on a field investigation that consisted of 74 sample zones across a total sample area of 436.872 hm2, we describe the population characteristics of yew (Taxus cuspidata), and the relationship between its distribution and site factors. There were a total of 179 631 individual yew plants in the 34 544 hm2 nature reserve, a very large population. The population distribution was correlated to elevation, slope position, aspect and slope gradient. Altitudes between 700 and 800 m had the greatest number of plants and thus the preferred habitat for natural yew populations. More individuals were found on shady slopes than sunny slopes, and more individuals at the upper and mid-slope positions than at the toe of the slope. There were more yew individuals located on slopes with a slope gradient <15° and numbers decreased substantially with increasing slope gradient.